RE: Inlet manifold problem/question

[Chris Coracini <Coracin@usdl.com>]

this sounds awfully close to the way the injectors are set up in the 16V
sciroccos.  there is a common air "tunnel" that connects the injectors.
this is an "air shrouded" engine.  the air-shroud system consist of an extra
little cap stuck on the end of each injector with a sealing O-ring.  this
lower O-ring seals against a lower injector insert, also only common to this
type of engine.  the air passage way connects all the injectors
together....somehow...  the purpose is for better atomization of the fuel at
lower rpms.  i'm 90% sure of it.  yeah, that's the ticket...  

chris
86 16V scirocco

> -----Original Message-----
> From:	Ewan Hopkins [SMTP:ewanhopkins@hotmail.com]
> Sent:	Thursday, March 04, 1999 10:00 AM
> To:	scirocco-l@scirocco.org
> Subject:	Inlet manifold problem/question
> 
> This is to anyone who has experience with the type of manifold on the 
> early audi 2.0L engines, i.e. with injector seats in the manifold and 
> not in the head.
> I have an audi 80 2.0 engine ('92 UK)with this type of head.  There is a 
> channel which links all the injector seats with a hose connector at the 
> TB end of the manifold.  On my engine it is covered with a plug. The 
> plastic injector seats have holes which appear to allow air flow down 
> between the seat and the injector, via this common channel.  Just the 
> other day I saw another audi 80 engine with the same common channel, but 
> in this case there is a hose which plugs in to the bottom of the rubber 
> joint (can't remember what it's called) just before the TB, i.e. it 
> bypasses the TB.
> 
> Does anyone know what this is supposed to do?  I though I saw something 
> about cooling the injectors but I'm not sure. There is no Haynes manual 
> for that series of Audi so I'm stuck for information about the engine.  
> I do have a problem with slight pinking if I've been stuck in a traffic 
> queue for a long time, which always goes once I get going again.  I 
> don't know if maybe this has something to do with that.
> I'd appreciate any help on this.
> 
> TIA
> 
> 
> 
> 
> Ewan Hopkins...
> 
> '85 Storm 2.0
> '86 GT 1.8
> 
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